Remove duplicate password validation logic to ensure consistency.
Changes:
- Remove custom isStrongPassword function (RegisterPage.tsx:569-576)
- Use PasswordChecklist validation result (passwordValid state) instead
- Add comprehensive test suite with 28 test cases
- Configure Vitest with jsdom environment and setup file
Test Coverage:
- Password validation rules (length, uppercase, lowercase, number, special chars)
- Special character consistency (/[@#$%!&*?]/)
- Edge cases and boundary conditions
- Refactoring consistency verification
All 78 tests passing (25 + 25 + 28).
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Co-authored-by: tinkle-community <tinklefund@gmail.com>
